Mon, 21 Nov 2016 23:13:27 -0800
Merge
attila@90 | 1 | /* |
attila@90 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
attila@90 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
attila@90 | 4 | * |
attila@90 | 5 | * This code is free software; you can redistribute it and/or modify it |
attila@90 | 6 | * under the terms of the GNU General Public License version 2 only, as |
attila@90 | 7 | * published by the Free Software Foundation. Oracle designates this |
attila@90 | 8 | * particular file as subject to the "Classpath" exception as provided |
attila@90 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
attila@90 | 10 | * |
attila@90 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
attila@90 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
attila@90 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
attila@90 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
attila@90 | 15 | * accompanied this code). |
attila@90 | 16 | * |
attila@90 | 17 | * You should have received a copy of the GNU General Public License version |
attila@90 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
attila@90 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
attila@90 | 20 | * |
attila@90 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
attila@90 | 22 | * or visit www.oracle.com if you need additional information or have any |
attila@90 | 23 | * questions. |
attila@90 | 24 | */ |
attila@90 | 25 | |
attila@90 | 26 | /* |
attila@90 | 27 | * This file is available under and governed by the GNU General Public |
attila@90 | 28 | * License version 2 only, as published by the Free Software Foundation. |
attila@90 | 29 | * However, the following notice accompanied the original version of this |
attila@90 | 30 | * file, and Oracle licenses the original version of this file under the BSD |
attila@90 | 31 | * license: |
attila@90 | 32 | */ |
attila@90 | 33 | /* |
attila@90 | 34 | Copyright 2009-2013 Attila Szegedi |
attila@90 | 35 | |
attila@90 | 36 | Licensed under both the Apache License, Version 2.0 (the "Apache License") |
attila@90 | 37 | and the BSD License (the "BSD License"), with licensee being free to |
attila@90 | 38 | choose either of the two at their discretion. |
attila@90 | 39 | |
attila@90 | 40 | You may not use this file except in compliance with either the Apache |
attila@90 | 41 | License or the BSD License. |
attila@90 | 42 | |
attila@90 | 43 | If you choose to use this file in compliance with the Apache License, the |
attila@90 | 44 | following notice applies to you: |
attila@90 | 45 | |
attila@90 | 46 | You may obtain a copy of the Apache License at |
attila@90 | 47 | |
attila@90 | 48 | http://www.apache.org/licenses/LICENSE-2.0 |
attila@90 | 49 | |
attila@90 | 50 | Unless required by applicable law or agreed to in writing, software |
attila@90 | 51 | distributed under the License is distributed on an "AS IS" BASIS, |
attila@90 | 52 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
attila@90 | 53 | implied. See the License for the specific language governing |
attila@90 | 54 | permissions and limitations under the License. |
attila@90 | 55 | |
attila@90 | 56 | If you choose to use this file in compliance with the BSD License, the |
attila@90 | 57 | following notice applies to you: |
attila@90 | 58 | |
attila@90 | 59 | Redistribution and use in source and binary forms, with or without |
attila@90 | 60 | modification, are permitted provided that the following conditions are |
attila@90 | 61 | met: |
attila@90 | 62 | * Redistributions of source code must retain the above copyright |
attila@90 | 63 | notice, this list of conditions and the following disclaimer. |
attila@90 | 64 | * Redistributions in binary form must reproduce the above copyright |
attila@90 | 65 | notice, this list of conditions and the following disclaimer in the |
attila@90 | 66 | documentation and/or other materials provided with the distribution. |
attila@90 | 67 | * Neither the name of the copyright holder nor the names of |
attila@90 | 68 | contributors may be used to endorse or promote products derived from |
attila@90 | 69 | this software without specific prior written permission. |
attila@90 | 70 | |
attila@90 | 71 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
attila@90 | 72 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
attila@90 | 73 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
attila@90 | 74 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
attila@90 | 75 | BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
attila@90 | 76 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
attila@90 | 77 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
attila@90 | 78 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
attila@90 | 79 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
attila@90 | 80 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
attila@90 | 81 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
attila@90 | 82 | */ |
attila@90 | 83 | |
attila@90 | 84 | package jdk.internal.dynalink; |
attila@90 | 85 | |
attila@90 | 86 | import java.lang.invoke.CallSite; |
attila@90 | 87 | import java.lang.invoke.MethodHandle; |
attila@90 | 88 | import java.lang.invoke.MutableCallSite; |
attila@90 | 89 | import java.lang.invoke.VolatileCallSite; |
attila@90 | 90 | import jdk.internal.dynalink.linker.GuardedInvocation; |
attila@90 | 91 | |
attila@90 | 92 | /** |
attila@90 | 93 | * Interface for relinkable call sites. Language runtimes wishing to use this framework must use subclasses of |
attila@90 | 94 | * {@link CallSite} that also implement this interface as their call sites. There is a readily usable |
attila@90 | 95 | * {@link MonomorphicCallSite} subclass that implements monomorphic inline caching strategy as well as a |
attila@90 | 96 | * {@link ChainedCallSite} that retains a chain of already linked method handles. The reason this is defined as an |
attila@90 | 97 | * interface instead of a concrete, albeit abstract class is that it allows independent implementations to choose |
attila@90 | 98 | * between {@link MutableCallSite} and {@link VolatileCallSite} as they see fit. |
attila@90 | 99 | * |
attila@90 | 100 | * @author Attila Szegedi |
attila@90 | 101 | */ |
attila@90 | 102 | public interface RelinkableCallSite { |
attila@90 | 103 | /** |
attila@90 | 104 | * Initializes the relinkable call site by setting a relink-and-invoke method handle. The call site implementation |
attila@90 | 105 | * is supposed to set this method handle as its target. |
attila@90 | 106 | * @param relinkAndInvoke a relink-and-invoke method handle supplied by the {@link DynamicLinker}. |
attila@90 | 107 | */ |
attila@90 | 108 | public void initialize(MethodHandle relinkAndInvoke); |
attila@90 | 109 | |
attila@90 | 110 | /** |
attila@90 | 111 | * Returns the descriptor for this call site. |
attila@90 | 112 | * |
attila@90 | 113 | * @return the descriptor for this call site. |
attila@90 | 114 | */ |
attila@90 | 115 | public CallSiteDescriptor getDescriptor(); |
attila@90 | 116 | |
attila@90 | 117 | /** |
attila@90 | 118 | * This method will be called by the dynamic linker every time the call site is normally relinked. It will be passed |
attila@90 | 119 | * a {@code GuardedInvocation} that the call site should incorporate into its target method handle. When this method |
attila@90 | 120 | * is called, the call site is allowed to keep other non-invalidated invocations around for implementation of |
attila@90 | 121 | * polymorphic inline caches and compose them with this invocation to form its final target. |
attila@90 | 122 | * |
attila@90 | 123 | * @param guardedInvocation the guarded invocation that the call site should incorporate into its target method |
attila@90 | 124 | * handle. |
attila@90 | 125 | * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied |
attila@90 | 126 | * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the |
attila@90 | 127 | * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target |
attila@90 | 128 | * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or |
attila@90 | 129 | * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. |
attila@90 | 130 | */ |
attila@90 | 131 | public void relink(GuardedInvocation guardedInvocation, MethodHandle fallback); |
attila@90 | 132 | |
attila@90 | 133 | /** |
attila@90 | 134 | * This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the |
attila@90 | 135 | * call site to throw away any prior linkage state. It will be passed a {@code GuardedInvocation} that the call site |
attila@90 | 136 | * should use to build its target method handle. When this method is called, the call site is discouraged from |
attila@90 | 137 | * keeping previous state around, and is supposed to only link the current invocation. |
attila@90 | 138 | * |
attila@90 | 139 | * @param guardedInvocation the guarded invocation that the call site should use to build its target method handle. |
attila@90 | 140 | * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied |
attila@90 | 141 | * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the |
attila@90 | 142 | * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target |
attila@90 | 143 | * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or |
attila@90 | 144 | * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. |
attila@90 | 145 | */ |
attila@90 | 146 | public void resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle fallback); |
attila@101 | 147 | } |